This is the mistake of drawing false conclusions about individuals from information that refers only to a collectivity. For example, that Washington DC, is a wealthy city does not mean that all, every or the Washingtonian is wealthy: the aggregate characteristic could be made up of very rich people and very poor people. The mistake of drifting from one level of analysis to another can also be made for different scales of group. For example, at the level of the nation-state, the USA has greater religious diversity than the UK. But most US towns, cities and counties are more religiously homogenous than is most of the UK. The USA’s religious pluralism is a mosaic of places that are very largely one faith or another. The ecological fallacy is particularly important in statistical analysis since it is quite possible to find that two factors are statistically associated even though they may in fact be unconnected.